31312313212 has 24 divisors (see below), whose sum is σ = 55072246320. Its totient is φ = 15577578240.

The previous prime is 31312313167. The next prime is 31312313267. The reversal of 31312313212 is 21231321313.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 638214 + ... + 685522.

It is an arithmetic number, because the mean of its divisors is an integer number (2294676930).

Almost surely, 2^31312313212 is an apocalyptic number.

It is an amenable number.

31312313212 is a deficient number, since it is larger than the sum of its proper divisors (23759933108).

31312313212 is a wasteful number, since it uses less digits than its factorization.

31312313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48141 (or 48139 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

Adding to 31312313212 its reverse (21231321313), we get a palindrome (52543634525).

The spelling of 31312313212 in words is "thirty-one billion, three hundred twelve million, three hundred thirteen thousand, two hundred twelve".